05465573 is referenced by 20 patents and cites 5 patents.

A multi-stage honeycomb heater includes: at least two honeycomb heaters electrically connected with each other and disposed along a stream of fluid; the two honeycomb heaters including furthest upstream honeycomb heater and a an adjacent honeycomb heater which is adjacent to and downstream of the furthest upstream honeycomb heater; each of the two honeycomb heaters having an electrically conductive honeycomb structure the honeycomb structure of the upstream honeycomb heater having slits for adjusting its electrical resistance and/or element for adjusting heat capacity of the honeycomb structure so that the ratio of applied power to heat capacity of the furthest upstream honeycomb heater is larger than the ratio of applied power to heat capacity of the adjacent honeycomb heater. Thus the upstream heater and the downstream heater can give similar temperature increases without a temperature distribution along a flow direction during the engine warm-up. A catalyst composition is coated on the partition walls of the honeycomb structure, and the light-off temperature of the catalyst composition of the upstream honeycomb heater is lower than that of the adjacent honeycomb heater.

Title
Multi-stage honeycomb heater
Application Number
8/91917
Publication Number
5465573
Application Date
July 16, 1993
Publication Date
November 14, 1995
Inventor
Masato Ogawa
Komaki
JP
Tadato Ito
Nagoya
JP
Fumio Abe
Handa
JP
Agent
Parkhurst Wendel & Rossi
Assignee
NGK Insulators
JP
IPC
B60L 1/02
F01N 3/20
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